I347-AT4 Datasheet, PDF (39/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

Device Functionality—I347-AT4
Upon deassertion of hardware reset, Register 0_0.11 and 16_0.2 are set to 1b to
default the I347-AT4 to a power down state.
Register 0_0.11 and 16_0.2 are logically ORed to form a power down control.
3.6.5.2
Cable Detect Power Down Modes
The I347-AT4 can be placed in cable detect power down modes by selecting either of
the two cable detect modes. Both modes enable the PHY to wake up on its own by
detecting activity on the CAT 5 cable. The cable detect modes only apply to the copper
media. The cable detect modes do not work while Copper Auto Select (Section 3.4) is
enabled. The status of the cable detect is reported in register 17_0.4 and the cable
detect changes are reported in register 19_0.4.
3.6.6
3.7
SGMII Effect on Low Power Modes
In some applications, SGMII must run continuously regardless of the state of the PHY.
Additional power is required to keep this SGMII interface running during low power
states.
If absolute minimal power consumption is required during the IEEE power down mode
or the cable detect modes, then register 16_2.3 should be set to 0b to enable SGMII to
power down. Note that for these settings to take effect a software reset must be
issued.
Auto-Negotiation
The I347-AT4 supports 10/100/1000BASE-T Copper auto-negotiation (IEEE 802.3
Clauses 28 and 40).
Auto-negotiation provides a mechanism for transferring information from the local
station to the link partner to establish speed, duplex, and master/slave preference
during a link session.
Auto-negotiation is initiated upon any of the following conditions:
• Power-up reset
• Hardware reset
• Software reset (register 0_0.15, 0_1.15, or 0_4.15)
• Restart auto-negotiation (register 0_0.9, 0_1.9, 0_4.9)
• Transition from power down to power up (register 0.0_0.11, 0_1.11, or 0_4.11)
• The link goes down
The following sections describe each of the auto-negotiation modes in detail.
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